Typically when the thermostat is stuck open the needle will swing between cold/hot on the gauge.
If it's stuck closed it'll run until the coolant in the engine is hot, normally when the tstat would let coolant into the radiator, and then the engine will over heat because the tstat isn't opening.
If your car is going to 3/4 and staying there, something else is probably wrong. The gauge has a big buffer zone, so if it's going higher than the middle the temp really is that hot. Check the coolant level, it's probably low, there could be a leak somewhere. __________________ ~Dave~
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